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Eccentric Cycling: A Promising Modality for Patients with Chronic Heart Failure.

Chasland, LC and Green, DJ and Maiorana, AJ and Nosaka, K and Haynes, A and Dembo, L and Naylor, LH (2017) Eccentric Cycling: A Promising Modality for Patients with Chronic Heart Failure. Medicine and Science in Sports and Exercise, 49 (4). pp. 646-651. ISSN 1530-0315

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Abstract

INTRODUCTION: Chronic heart failure (CHF) is characterized by dyspnea and poor exercise tolerance, which decreases aerobic capacity (V˙O2peak), a measure strongly correlated with quality of life and mortality. In healthy populations, eccentric (ECC) cycling can be performed at a lower oxygen demand for matched workload, compared to concentric (CON) cycling, but few studies have previously investigated ECC cycling in CHF. We hypothesized that, when matched for external workload (Watts), an ECC cycling bout would be performed at a lower cardiorespiratory load (V˙O2) than CON in patients with CHF. METHODS: Eleven CHF patients (10 males) with impaired left ventricular systolic function (ejection fraction 31±12%) completed a CON V˙O2peak test, with the subsequent ECC and CON protocols set at 70% of individual maximal CON power (Watts). Oxygen consumption (V˙O2), respiratory exchange ratio (RER), minute ventilation (V˙E), heart rate (HR) and rate pressure product (RPP) were compared between conditions. RESULTS: ECC was performed at a lower V˙O2 (12.3±1.3 vs. 14.1±0.8 mL.kgmin, P=0.01), RER (0.92±0.02 vs. 0.96±0.01, P=0.01) and V˙E (36.5±4.4 vs. 40.2±2.0 L/min, P=0.04) in comparison to CON, despite both conditions being performed at matched workloads. Heart rate (101±5 vs. 96±1 bpm; P=0.06) and RPP (13,539±788 vs. 11,911±227 bpm.mmHg, P=0.15) were not significantly different between conditions. CONCLUSION: When matched for external workload, ECC cycling can be performed with a lower oxygen demand than CON in patients with CHF. Eccentric cycling is a promising modality for cardiac rehabilitation in severely deconditioned patients with CHF.

Item Type: Article
Additional Information: 'This is a non-final version of an article published in final form in Medicine & Science in Sports & Exercise, Eccentric Cycling: A Promising Modality for Patients with Chronic Heart Failure. Lauren C Chasland, Daniel J Green, Andrew J Maiorana, Kazunori Nosaka, Andrew Haynes, Lawrence Dembo, and Louise H Naylor. Medicine & Science in Sports & Exercise http://dx.doi.org/10.1249/MSS.0000000000001151
Uncontrolled Keywords: 1106 Human Movement And Sports Science
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure
R Medicine > R Medicine (General)
Divisions: Sport & Exercise Sciences
Publisher: American College of Sports Medicine
Related URLs:
Date Deposited: 23 Nov 2016 12:04
Last Modified: 07 Nov 2017 00:50
DOI or Identification number: 10.1249/MSS.0000000000001151
URI: http://researchonline.ljmu.ac.uk/id/eprint/4855

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